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Home > Mobile > Application Development > Mastering macOS Programming
Mastering macOS Programming
Mastering macOS Programming

Mastering macOS Programming: Hands-on guide to macOS Sierra Application Development

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Mastering macOS Programming

Basic Swift

So, let's get going with a rapid rundown of Swift's basic types and syntax. As befits a book aimed at developers with some experience of programming under their belts, this chapter will not be about the basics of programming, but simply an overview of what we will assume you know as we move through the following chapters. Think of it as a kind of Swift comments cheat-sheet, if you like.

You already understand something of variable declaration, control flow, arrays and dictionaries, and functions. Make sure you fully understand everything that is presented in this chapter, and if there are any concepts you don't understand by the end of it, it's probably a good idea to delve into them somewhat before moving on to Chapter 5, Advanced Swift.

I have tried in this chapter to flag a few typical gotchas that occur when coming from other languages or earlier versions of Swift. Some of...

Variables and types

We can declare variables as follows:

var a: Int = 1

In the preceding line of code, a is declared to be of type Int, with a value of 1. Since only an Int can be assigned the value 1, Swift can automatically infer the type of a, and it is not necessary to explicitly include the type information in the variable declaration:

var a = 1

In the preceding code, it is equally clear to both Swift and the reader what type a belongs to.

What, no semicolons?
You can add them if you want to, and you'll have to if you want to put two statements on the same line (why would you do that?). But no, semicolons belong to C and its descendants, and despite its many similarities to that particular family of languages, Swift has left the nest.

The value of a var can be changed by simply assigning to it a new value:

var a = 1 
a = 2

However, in Swift, we can also declare a constant, which is immutable, using the...

Comments

Swift has adopted C-style comments of both forms:

// We have used this one already 
// in previous sections of this chapter

When it starts to get messy, with // at the beginning of each commented line, we have the following multiline comments:

/* 
This is a multiline 
comment, for those times when 
you just can't say it 
in a few words 
*/

Unlike some languages, you can nest these comments, which is handy if you need to comment out a large section of code that itself contains comments:

/* 
Comments can be nested, 
/* 
like this one 
*/ 
which can be helpful. 
*/

Arrays, dictionaries, and sets

Swift offers a comprehensive set of collection types, as one would expect. In common with many other languages, each of these collection types will only hold values of the same type. Thus, the type of an Array of Int values is distinct from the type of an Array of Float values, for example. If you're coming from Objective C, you may quickly come to appreciate the type safety and simplicity of Swift Array objects over NSArray.

There are no separate mutable and immutable collection types, as such, since all objects in Swift can be declared with either var or let.

Arrays

Arrays are zero-based, and look like this:

let myArr = [21, 22, 23]

They are equipped with a pretty standard set of methods, such as count and accessor methods...

Value and reference types

The basic data types of Swift, such as Int, Double, and Bool, are said to be value types. This means that, when passing a value to a function (including assignment of variables and constants), it is copied into its new location:

var x1 = 1 
var y1 = x1 
y1 = 2 
x1 == 1 // true

However, this concept extends to String, Array, Dictionary, and many other objects that, in some languages, notably Objective C, are passed by reference. Passing by reference means that we pass a pointer to the actual object itself, as an argument, rather than just copy its value:

var referenceObject1 = someValue 
var referenceObject2 = referenceObject1 
referenceObject2 = someNewValue

These two variables now point to the same instance.

While this pattern is frequently desirable, it does leave a lot of variables sharing the same data--if you change one, you change the others. And that's a great source of bugs...

Variables and types

We can declare variables as follows:

var a: Int = 1

In the preceding line of code, a is declared to be of type Int, with a value of 1. Since only an Int can be assigned the value 1, Swift can automatically infer the type of a, and it is not necessary to explicitly include the type information in the variable declaration:

var a = 1

In the preceding code, it is equally clear to both Swift and the reader what type a belongs to.

Note

What, no semicolons?You can add them if you want to, and you'll have to if you want to put two statements on the same line (why would you do that?). But no, semicolons belong to C and its descendants, and despite its many similarities to that particular family of languages, Swift has left the nest.

The value of a var can be changed by simply assigning to it a new value:

var a = 1 
a = 2

However, in Swift, we can also declare a constant, which is immutable, using the let keyword:

let b = 2

The value of b is now set permanently. The following attempt to...

Comments

Swift has adopted C-style comments of both forms:

// We have used this one already 
// in previous sections of this chapter

When it starts to get messy, with // at the beginning of each commented line, we have the following multiline comments:

/* 
This is a multiline 
comment, for those times when 
you just can't say it 
in a few words 
*/

Unlike some languages, you can nest these comments, which is handy if you need to comment out a large section of code that itself contains comments:

/* 
Comments can be nested, 
/* 
like this one 
*/ 
which can be helpful. 
*/

Arrays, dictionaries, and sets

Swift offers a comprehensive set of collection types, as one would expect. In common with many other languages, each of these collection types will only hold values of the same type. Thus, the type of an Array of Int values is distinct from the type of an Array of Float values, for example. If you're coming from Objective C, you may quickly come to appreciate the type safety and simplicity of Swift Array objects over NSArray.

There are no separate mutable and immutable collection types, as such, since all objects in Swift can be declared with either var or let.

Arrays

Arrays are zero-based, and look like this:

let myArr = [21, 22, 23]

They are equipped with a pretty standard set of methods, such as count and accessor methods:

let count = myArr.count // 3 
let secondElmt = myArr[1] // 22 
let firstElmt = myArr.first // 21 
let lastElmt = myArr.last // 23

Elements are set, logically enough, as follows:

myArr[1] = 100

They are a lot more convenient to work with than...

Value and reference types

The basic data types of Swift, such as Int, Double, and Bool, are said to be value types. This means that, when passing a value to a function (including assignment of variables and constants), it is copied into its new location:

var x1 = 1 
var y1 = x1 
y1 = 2 
x1 == 1 // true

However, this concept extends to String, Array, Dictionary, and many other objects that, in some languages, notably Objective C, are passed by reference. Passing by reference means that we pass a pointer to the actual object itself, as an argument, rather than just copy its value:

var referenceObject1 = someValue 
var referenceObject2 = referenceObject1 
referenceObject2 = someNewValue

These two variables now point to the same instance.

While this pattern is frequently desirable, it does leave a lot of variables sharing the same data--if you change one, you change the others. And that's a great source of bugs.

So, in Swift, we have many more value types than reference types. This even extends...

Operators

We will take a quick tour of the most common operators in Swift, leaving such esoteric topics as custom operators for Chapter 5, Advanced Swift.

Mathematical operators

The five basic math operators will need no explanation here:

-  
+  
*  
/ 
%

They are so-called infix operators, meaning that they are placed between their two operands:

let x = (a * a) + (b * b)

The usual rules of precedence apply.

Augmented assignment

As in many other C-derived languages, we can replace:

x = x + 1

With:

x += 1

There are versions of this for the other mathematical operators:

 -= *= /= %=

Readers should already be familiar with all these operators.

Note

There is no ++ or -- operator in Swift 3. Older versions of the language did, in fact, retain these from the C family of languages, so don't be too surprised if you come across it in older posts on the Web. If you do need to do an i++ or i-- (although for loops make these operators largely unnecessary), use i += 1 or i -= 1.

Comparison operators

Swift's comparison...

Structs, classes, and other data structures

Ways of defining and handling structured data are an important part of any programming language that supports object-oriented programming. Swift has extended the patterns typical of Objective C, Java, and the like, to include structures that are passed by value, called structs, and those that are passed by reference, called classes (see Value and reference types in this chapter). There is also the much lighter-weight tuple, which offers a kind of bridge between data structures and collection types such as dictionaries.

As well as the fact that structs are value types and classes are reference types, there are a few other points of departure, but the two structures have a lot more similarities than they do differences.

Structs

A Swift struct is basically a group of data, organized into properties, as well as methods that do something to or with those properties. There is more to come, but we'll start there for the sake of simplicity.

Let's set up a...

Enumerations

Swift offers another valuable structure, the Enum. While enumerations are a common feature of programming languages, Swift's Enum offers very much more than a simple mapping of integer values to labels.

Firstly, in cases where there is no logical mapping of Enum values to integers (or values of any other type), we can declare an Enum to be a type in its own right:

enum Color 
{ 
    case red 
    case amber 
    case green 
}

So, here we have a case in which it would be nonsensical to map colors to integers. Swift will not allow us to try to derive some integer value from Color.red, either.

Note that the Enum name is capitalized, whereas a case is written in lowercase.

Note

This was not the case (no pun intended) in previous versions of Swift--another thing to be wary of when reading older posts, tutorials, and documentation.

There are, however, frequent uses for an Enum that do correspond to some underlying value, and Swift lets us do this, too:

enum Medal: Int 
{ 
    case gold ...
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Key benefits

  • Learn to harness the power of macOS with the elegance of the Swift programming language
  • Become highly competent in building apps on the macOS platform
  • Get the most in-depth guide with a hands-on approach on the latest version of macOS

Description

macOS continues to lead the way in desktop operating systems, with its tight integration across the Apple ecosystem of platforms and devices. With this book, you will get an in-depth knowledge of working on macOS, enabling you to unleash the full potential of the latest version using Swift 3 to build applications. This book will help you broaden your horizons by taking your programming skills to next level. The initial chapters will show you all about the environment that surrounds a developer at the start of a project. It introduces you to the new features that Swift 3 and Xcode 8 offers and also covers the common design patterns that you need to know for planning anything more than trivial projects. You will then learn the advanced Swift programming concepts, including memory management, generics, protocol orientated and functional programming and with this knowledge you will be able to tackle the next several chapters that deal with Apple’s own Cocoa frameworks. It also covers AppKit, Foundation, and Core Data in detail which is a part of the Cocoa umbrella framework. The rest of the book will cover the challenges posed by asynchronous programming, error handling, debugging, and many other areas that are an indispensable part of producing software in a professional environment. By the end of this book, you will be well acquainted with Swift, Cocoa, and AppKit, as well as a plethora of other essential tools, and you will be ready to tackle much more complex and advanced software projects.

Who is this book for?

This book is for developers who have some experience with macOS and want to take their skills to next level by unlocking the full potential of latest version of macOS with Swift 3 to build impressive applications. Basic knowledge of Swift will be beneficial but is not required.

What you will learn

  • Combine beautiful design with robust code for the very best user experience
  • Bring the best coding practices to the new macOS Sierra
  • See what's new in Swift 3.0 and how best to leverage the Swift language
  • Master Apple's tools, including Xcode, Interface Builder, and Instruments
  • Use Unix and other common command-line tools to increase productivity
  • Explore the essential Cocoa frameworks, including networking, animation, audio, and video
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Length: 626 pages
Edition : 1st
Language : English
ISBN-13 : 9781786461698
Category :
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Languages :
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Concepts :
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Tools :
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Length: 626 pages
Edition : 1st
Language : English
ISBN-13 : 9781786461698
Category :
Mobile
Languages :
Swift
Concepts :
Application Development
Tools :
MacOS

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Table of Contents

20 Chapters
Hello macOS Chevron down icon Chevron up icon
Hello macOS
It's going to be Swift
And more than Swift
It's going to be Xcode and more
The book's overall structure
The serious developer's toolkit
What you'll get from this book
Summary
Basic Swift Chevron down icon Chevron up icon
Basic Swift
Variables and types
Comments
Arrays, dictionaries, and sets
Value and reference types
Operators
Structs, classes, and other data structures
Enumerations
Optionals
Control flow
Functions
Summary
Checking Out the Power of Xcode Chevron down icon Chevron up icon
Checking Out the Power of Xcode
A quick and simple sketch app
Speeding it up with code snippets
Logging with special literals
Getting the most out of breakpoints
Behaviors
Understanding schemes
Why build configs are so cool
Summary
MVC and Other Design Patterns Chevron down icon Chevron up icon
MVC and Other Design Patterns
Programming paradigms
Encapsulation
A path through the forest
Summary
Advanced Swift Chevron down icon Chevron up icon
Advanced Swift
Control flow
Functions
Enumerations as data structures
Protocols
Customizing operators
Collection types
Optionals
Summary
Cocoa Frameworks - The Backbone of Your Apps Chevron down icon Chevron up icon
Cocoa Frameworks - The Backbone of Your Apps
Understanding Foundation Kit
Import statements
Leveraging key-value observing
Cocoa bindings
Summary
Creating Views Programmatically Chevron down icon Chevron up icon
Creating Views Programmatically
Why code instead of IB?
Setting our goals
Coding a table view
Observing without bindings
Adding further control elements in code
Summary
Strings and Text Chevron down icon Chevron up icon
Strings and Text
Strings and characters
NSTextView
Summary
Getting More from Interface Builder Chevron down icon Chevron up icon
Getting More from Interface Builder
Advanced IB navigation
Debug View Hierarchy
Encapsulating views with NSStackView
Taming the storyboard
Summary
Drawing on the Strength of Core Graphics Chevron down icon Chevron up icon
Drawing on the Strength of Core Graphics
Why not use an image?
Why not use native views?
Creating custom views
Custom buttons
Dial clock
Pie clock
Summary
Core Animation Chevron down icon Chevron up icon
Core Animation
What is Core Animation?
Introducing CALayer
Animating CALayer objects
Animating NSViews
Summary
Handling Errors Gracefully Chevron down icon Chevron up icon
Handling Errors Gracefully
Errors aren't mistakes
Expecting the unexpected
Swift error handling
NSError handling
Summary
Persistent Storage Chevron down icon Chevron up icon
Persistent Storage
Creating a project
Using UserDefaults
Saving text to the Documents folder
NSCoding/NSKeyedArchiver
Presenting open and save dialog boxes
Summary
The Benefits of Core Data Chevron down icon Chevron up icon
The Benefits of Core Data
What Core Data is, and isn't
Core Data, Cocoa Bindings, and no code
Using our data model
More about Core Data
Summary
Connect to the World - Networking Chevron down icon Chevron up icon
Connect to the World - Networking
Patterns for downloading data
Downloading using closures
Downloading using a URLSession delegate
No third-party frameworks?
The URLSession framework
Cache rewards
Summary
Concurrency and Asynchronous Programming Chevron down icon Chevron up icon
Concurrency and Asynchronous Programming
Concurrency and asynchronicity
Summary
Understanding Xcodes Debugging Tools Chevron down icon Chevron up icon
Understanding Xcodes Debugging Tools
Checking out Xcode's debugging tools
Leveraging breakpoints
Summary
LLDB and the Command Line Chevron down icon Chevron up icon
LLDB and the Command Line
LLDB
Summary
Deploying Third - Party Code Chevron down icon Chevron up icon
Deploying Third - Party Code
Common use cases
Distribution methods
Pros and cons
Different installation methods
Other package managers
The price of complexity
Summary
Wrapping It Up Chevron down icon Chevron up icon
Wrapping It Up
App distribution
Summary
And finally

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howld May 10, 2018
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Great tutorial and very easy understand to understand the concept
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Sorin Dolha Dec 15, 2017
Full star icon Full star icon Full star icon Full star icon Full star icon 5
I love this book. It's generally up to date (as of December 2017), the author has a nice style of not presenting everything and letting the reader also think a bit, and often offers - besides the general topics - tricks that I find interesting and useful.
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Amazon Customer May 22, 2018
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very good
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Jim McCoy Apr 04, 2022
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Lots of typos and it appears the errata is no longer available. Could really use an update. I like the prose and the somewhat lighthearted style. Helps keep things interesting.
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Amazon Customer May 16, 2019
Full star icon Empty star icon Empty star icon Empty star icon Empty star icon 1
I'm sure this was a great book when it first came out but the current version of swift and xcode does not work with the tutorials cover. spent hours trying to get the first project (sales tax calculator) to work and never could, had a programmer friend look into it, and they said it was because the version of swift being covered in the book is obsolete
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About the authors

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Profile icon Gregory Casamento
Gregory Casamento
I am a software engineer with 25+ years of experience. I am the maintainer of the GNUstep project. I helped to develop Winamp for the Mac as well as many other highly visible projectsOpen Logic Corporation (my company). I have worked for AMGEN, AOL, Raytheon, Hughes Aircraft and many others.
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Profile icon Stuart Grimshaw
Stuart Grimshaw
Stuart Grimshaw has programmed for Apple computers since the days before OS X and has been involved with developing for the Apple Watch since its release. Born in the UK and having lived in Germany and the Netherlands, he is currently a Senior iOS developer in London, England, United Kingdom. He has around 10 years of end-to-end development of projects experience in, iOS, iPadOS, watchOS (Apple Watch), tvOS (AppleTV), and macOS. He is passionate about the potential of the Apple Watch and Apple TV, as well as Apple's Swift programming language, and is a keen proponent of beach coding.
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FAQs

What is the delivery time and cost of print book? Chevron down icon Chevron up icon

Shipping Details

USA:

'

Economy: Delivery to most addresses in the US within 10-15 business days

Premium: Trackable Delivery to most addresses in the US within 3-8 business days

UK:

Economy: Delivery to most addresses in the U.K. within 7-9 business days.
Shipments are not trackable

Premium: Trackable delivery to most addresses in the U.K. within 3-4 business days!
Add one extra business day for deliveries to Northern Ireland and Scottish Highlands and islands

EU:

Premium: Trackable delivery to most EU destinations within 4-9 business days.

Australia:

Economy: Can deliver to P. O. Boxes and private residences.
Trackable service with delivery to addresses in Australia only.
Delivery time ranges from 7-9 business days for VIC and 8-10 business days for Interstate metro
Delivery time is up to 15 business days for remote areas of WA, NT & QLD.

Premium: Delivery to addresses in Australia only
Trackable delivery to most P. O. Boxes and private residences in Australia within 4-5 days based on the distance to a destination following dispatch.

India:

Premium: Delivery to most Indian addresses within 5-6 business days

Rest of the World:

Premium: Countries in the American continent: Trackable delivery to most countries within 4-7 business days

Asia:

Premium: Delivery to most Asian addresses within 5-9 business days

Disclaimer:
All orders received before 5 PM U.K time would start printing from the next business day. So the estimated delivery times start from the next day as well. Orders received after 5 PM U.K time (in our internal systems) on a business day or anytime on the weekend will begin printing the second to next business day. For example, an order placed at 11 AM today will begin printing tomorrow, whereas an order placed at 9 PM tonight will begin printing the day after tomorrow.


Unfortunately, due to several restrictions, we are unable to ship to the following countries:

  1. Afghanistan
  2. American Samoa
  3. Belarus
  4. Brunei Darussalam
  5. Central African Republic
  6. The Democratic Republic of Congo
  7. Eritrea
  8. Guinea-bissau
  9. Iran
  10. Lebanon
  11. Libiya Arab Jamahriya
  12. Somalia
  13. Sudan
  14. Russian Federation
  15. Syrian Arab Republic
  16. Ukraine
  17. Venezuela
What is custom duty/charge? Chevron down icon Chevron up icon

Customs duty are charges levied on goods when they cross international borders. It is a tax that is imposed on imported goods. These duties are charged by special authorities and bodies created by local governments and are meant to protect local industries, economies, and businesses.

Do I have to pay customs charges for the print book order? Chevron down icon Chevron up icon

The orders shipped to the countries that are listed under EU27 will not bear custom charges. They are paid by Packt as part of the order.

List of EU27 countries: www.gov.uk/eu-eea:

A custom duty or localized taxes may be applicable on the shipment and would be charged by the recipient country outside of the EU27 which should be paid by the customer and these duties are not included in the shipping charges been charged on the order.

How do I know my custom duty charges? Chevron down icon Chevron up icon

The amount of duty payable varies greatly depending on the imported goods, the country of origin and several other factors like the total invoice amount or dimensions like weight, and other such criteria applicable in your country.

For example:

  • If you live in Mexico, and the declared value of your ordered items is over $ 50, for you to receive a package, you will have to pay additional import tax of 19% which will be $ 9.50 to the courier service.
  • Whereas if you live in Turkey, and the declared value of your ordered items is over € 22, for you to receive a package, you will have to pay additional import tax of 18% which will be € 3.96 to the courier service.
How can I cancel my order? Chevron down icon Chevron up icon

Cancellation Policy for Published Printed Books:

You can cancel any order within 1 hour of placing the order. Simply contact [email protected] with your order details or payment transaction id. If your order has already started the shipment process, we will do our best to stop it. However, if it is already on the way to you then when you receive it, you can contact us at [email protected] using the returns and refund process.

Please understand that Packt Publishing cannot provide refunds or cancel any order except for the cases described in our Return Policy (i.e. Packt Publishing agrees to replace your printed book because it arrives damaged or material defect in book), Packt Publishing will not accept returns.

What is your returns and refunds policy? Chevron down icon Chevron up icon

Return Policy:

We want you to be happy with your purchase from Packtpub.com. We will not hassle you with returning print books to us. If the print book you receive from us is incorrect, damaged, doesn't work or is unacceptably late, please contact Customer Relations Team on [email protected] with the order number and issue details as explained below:

  1. If you ordered (eBook, Video or Print Book) incorrectly or accidentally, please contact Customer Relations Team on [email protected] within one hour of placing the order and we will replace/refund you the item cost.
  2. Sadly, if your eBook or Video file is faulty or a fault occurs during the eBook or Video being made available to you, i.e. during download then you should contact Customer Relations Team within 14 days of purchase on [email protected] who will be able to resolve this issue for you.
  3. You will have a choice of replacement or refund of the problem items.(damaged, defective or incorrect)
  4. Once Customer Care Team confirms that you will be refunded, you should receive the refund within 10 to 12 working days.
  5. If you are only requesting a refund of one book from a multiple order, then we will refund you the appropriate single item.
  6. Where the items were shipped under a free shipping offer, there will be no shipping costs to refund.

On the off chance your printed book arrives damaged, with book material defect, contact our Customer Relation Team on [email protected] within 14 days of receipt of the book with appropriate evidence of damage and we will work with you to secure a replacement copy, if necessary. Please note that each printed book you order from us is individually made by Packt's professional book-printing partner which is on a print-on-demand basis.

What tax is charged? Chevron down icon Chevron up icon

Currently, no tax is charged on the purchase of any print book (subject to change based on the laws and regulations). A localized VAT fee is charged only to our European and UK customers on eBooks, Video and subscriptions that they buy. GST is charged to Indian customers for eBooks and video purchases.

What payment methods can I use? Chevron down icon Chevron up icon

You can pay with the following card types:

  1. Visa Debit
  2. Visa Credit
  3. MasterCard
  4. PayPal
What is the delivery time and cost of print books? Chevron down icon Chevron up icon

Shipping Details

USA:

'

Economy: Delivery to most addresses in the US within 10-15 business days

Premium: Trackable Delivery to most addresses in the US within 3-8 business days

UK:

Economy: Delivery to most addresses in the U.K. within 7-9 business days.
Shipments are not trackable

Premium: Trackable delivery to most addresses in the U.K. within 3-4 business days!
Add one extra business day for deliveries to Northern Ireland and Scottish Highlands and islands

EU:

Premium: Trackable delivery to most EU destinations within 4-9 business days.

Australia:

Economy: Can deliver to P. O. Boxes and private residences.
Trackable service with delivery to addresses in Australia only.
Delivery time ranges from 7-9 business days for VIC and 8-10 business days for Interstate metro
Delivery time is up to 15 business days for remote areas of WA, NT & QLD.

Premium: Delivery to addresses in Australia only
Trackable delivery to most P. O. Boxes and private residences in Australia within 4-5 days based on the distance to a destination following dispatch.

India:

Premium: Delivery to most Indian addresses within 5-6 business days

Rest of the World:

Premium: Countries in the American continent: Trackable delivery to most countries within 4-7 business days

Asia:

Premium: Delivery to most Asian addresses within 5-9 business days

Disclaimer:
All orders received before 5 PM U.K time would start printing from the next business day. So the estimated delivery times start from the next day as well. Orders received after 5 PM U.K time (in our internal systems) on a business day or anytime on the weekend will begin printing the second to next business day. For example, an order placed at 11 AM today will begin printing tomorrow, whereas an order placed at 9 PM tonight will begin printing the day after tomorrow.


Unfortunately, due to several restrictions, we are unable to ship to the following countries:

  1. Afghanistan
  2. American Samoa
  3. Belarus
  4. Brunei Darussalam
  5. Central African Republic
  6. The Democratic Republic of Congo
  7. Eritrea
  8. Guinea-bissau
  9. Iran
  10. Lebanon
  11. Libiya Arab Jamahriya
  12. Somalia
  13. Sudan
  14. Russian Federation
  15. Syrian Arab Republic
  16. Ukraine
  17. Venezuela